It had been a week since the Easter holidays, and the Gryffindor Quidditch Team were back on the pitch practising for their upcoming match against Hufflepuff.

Oliver Wood was insisting on team practices every night after dinner, but Jack and the team beat him down to every-other-night instead.

Still even with that, Jack and Harry agreed there wasn't much time to do anything that wasn't Quidditch or homework.

"I wish Oliver would lighten up with these practices," Jack said as they went up to the dormitories to put their brooms away. "I was supposed to be going on a walk-about-the-school with Elisa tonight, but no… he wanted one more extra practice before tomorrow's match."

"At least they've been getting drier than they were before," Harry said yawning a little, but paused when they opened the door to their room and saw all of both their things were all over the place, and Neville was in the middle of the room looking frantic.

"Guys – I - I don't know who did it, I just found it like this," he said looking at his friends.

Together Jack and Harry went about sorting their things out and checking everything was there.

As they, with the help of Neville remade their beds, Dean, Seamus, and Ron came in.

"Wow, what happened you guys?"

"No idea," Harry said but Jack stayed silent having a good idea what happened, he just didn't want to say it in front of everyone.

Ron mean while was looking at Harry's robes and seeing all the pockets were pulled out.

"Whoever it was seems to have been looking for something," he said "Anything missing?"

After a few minutes, Jack said he had everything accounted for.

Harry on the other hand stated in a whisper "Riddle's diary is gone."

"What?" Ron said not believing it.

Hearing this, Jack quickly ran down to the common room and looked around for a anyone acting suspicious, or rather a certain someone, but he couldn't see her in here.

Seeing Fred and George on the other hand he went to ask them some questions while Harry and Ron talked to Hermione.

"Hey guys, do you know where Ginny is?" he asked.

"Nope," they said together.

"Why?" George asked while Fred looked around the room just in case.

"I think she might have just been going through my and Harry's things looking for something that could be dangerous." Jack said not wanting to explain too much.

"Well when we see her we'll ask" Fred said "Now… What plans do we have for our birthday this year?" he asked.

Rolling his eyes Jack handed a list over.

"I have a few ideas, and have already asked April for the things that are needed." he said as the twins smiled as they read the list.

As they were Jack saw Harry and Ron talking to Hermione.

The next day, everyone woke up to a bright sunny day and a cool breeze.

"Perfect Quidditch conditions!" Wood said enthusiastically at the Gryffindor table at breakfast loading his team's plates with food while forgetting to give himself anything. "Harry, buck up there, you need a decent breakfast."

"You need to eat something too, Oliver," Elisa, who was there with Luna sitting with Jack to give him good luck. "No point having a good team if the captain isn't up for it too."

Blushing at the advice and the giggles from his fellow Gryffindor's Oliver starting loading his own plate and ate what was on it, keeping his head down.

"Now that's sorted," Elisa said calmly turning to Jack "Worked out what this monster could be yet?"

"No." Jack said looking through his notes "It's got to be some kind of snake related monster, but none of the ones I can think of have the power to petrify their prey."

"Maybe it doesn't," Luna said playing with Baby Tooth "Maybe they just get like that because something else happens or something gets in the way."

Considering this, Jack got up saying he'll meet everyone on the Quidditch Pitch.

A few minutes after he left, Tooth, Aster, North, and Sandy came in and over to Harry and his friends who were arguing on whether they should tell someone about the stolen diary.

"Hey kids, seen Jack?" Bunny asked sitting down.

"He's just gone to investigate something about what Slytherin's Monster could be," Luna spoke up in her usual dreamy voice.

"Ok…" Bunny said not understanding what was just said but dropped it.

Soon it was time for the team to go get their Quidditch things, so Harry, Ron, Hermione, and the Guardians left the Hall to help Harry retrieve his gear.

However as he stepped onto the bottom step of the staircase, Harry stopped and called out: "The voice!"

Looking over his shoulder he said "I just heard it again – didn't you?"

"Voice?" the Guardians asked Bunny looking around and Tooth looking worried.

"Since Halloween, every so often Jack and I hear a voice from somewhere and then someone ends up petrified." Harry explained.

"What?" Tooth, North, and Bunny asked, Sandy just widening his eyes.

Just then Hermione clapped her hand to her forehead.

"Guys, I think I just understood something, I've got to go to the library!"

And she was off without telling anyone what was going on.

In the library, Jack had heard the voice too and started to look around, making sure nobody else was in here seeing as it sounded the loudest here.

He was carrying his notes and the book he found that might help work things out.

Making sure everything was fine Jack started speaking Dragonese to try and contact it.

'I am Jack Frost, Spirit of Winter and Guardian of Fun, why are you attacking the students of this school?'

'It is what my Masssster is ordering me to do…' the voice replied sounding close.

Jack was about to ask another question when Hermione came barging in and went straight towards the Magical Creatures section, right where the voice was coming from.

Worried, Jack grabbed her and pulled her back.

"Hermione don't, I think whatever it is, it's there," he said whispering – well they were in a library.

"What?" she asked worried.

"Just don't go around there without checking first, because I think I've worked out what it is." Jack said showing her the page in the book he had."

As she was reading it Jack went around the bookshelf and keeping his head down spoke to it again.

'Who is your Master, great King of Serpents?'

The creature moved to cover Jack with its shadow.

'My Master is the descendent of my true Master,' the giant snake replied not giving away any information.

Jack cursed in his head, forgetting how much these giant magical creatures liked to speak in riddles.

Really not wanting to play 20 Questions with this thing, Jack was about to try and ask if the creature would just go back to the Chamber of Secrets when he heard two surprised gasps behind him.

Quickly he span around and saw a mirror and the bright big yellow eyes reflected in it.